Imaging lens assembly

1. An imaging lens assembly comprising:

a first lens with positive refractive power;

a second lens with negative refractive power;

a third lens with positive refractive power;

a forth lens with positive refractive power; and

a fifth lens with negative refractive power;

wherein the first lens, the second lens, the third lens, the forth lens and the fifth lens are arranged in sequence from the object side to the image side, and satisfy following conditions (1) to (3):

0.08≦ R 1/ R 2≦0.25  (1)

−5.00≦ R 3/ R 4≦−0.30  (2)

−1.50≦ R 9/ R 10≦−0.30  (3)

wherein R1 is the curvature radius of the object side of the first lens; R2 is the curvature radius of the image side of the first lens; R3 is the curvature radius of the object side of the second lens; R4 is the curvature radius of the image side of the second lens; R9 is the curvature radius of the object side of the fifth lens; and R10 is the curvature radius of the image side of the fifth lens.

2. The imaging lens assembly of claim 1 , further satisfying the following condition (4):

10.00≦ f 3/ f≦ 70.00  (4)

wherein f is the focal length of the imaging lens assembly; and f3 is the focal length of the third lens.

3. The imaging lens assembly of claim 1 , further satisfying the following condition (5):

0.65≦ R 5/ R 6≦1.05  (5)

wherein R5 is the curvature radius of the object side of the third lens; and R6 is the curvature radius of the image side of the third lens.

4. The imaging lens assembly of claim 1 , wherein the first lens satisfies following conditions (1-A):

0.10≦ R 1/ R 2≦0.18  (1-A).

5. The imaging lens assembly of claim 1 , wherein the fifth lens satisfies following conditions (3-A):

−0.70≦ R 9/ R 10≦−0.50  (3-A).

6. The imaging lens assembly of claim 3 , wherein the third lens satisfies following conditions (3-A):

0.70≦ R 5/ R 6≦0.95  (5-A).